多項選擇題Which three statements about the DHCP snooping feature on Cisco Nexus switches are true？ （）

A. DHCP snooping commands are not available until the feature is enabled with the feature dhcp- snooping command.
B. When you enable the DHCP snooping feature， the switch begins building and maintaining the DHCP snooping binding database.
C. The switch will not validate DHCP messages received or use the DHCP snooping binding database to validate subsequent requests from untrusted hosts until DHCP snooping is enabled globally and for each specific VLAN.
D. Globally disabling DHCP snooping removes all DHCP snooping configuration on the switch.
E. Globally disabling DHCP snooping does not remove any DHCP snooping configuration or the configuration of other features that are dependent upon the DHCP snooping feature.


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1.單項選擇題Overlay Transport Virtualization （OTV） uses the Authoritative Edge Device （AED） to perform which tasks？（）

A. The AED is responsible for sending all unicast traffic in a site， while either node in a site can transmit multicast and broadcast.
B. The AED is responsible for load balancing all traffic for all VLANs across the transport network.
C. The AED is responsible for handling all unicast， broadcast， and multicast traffic for a given VLAN within a site.
D. The AED is responsible for MAC address dispute contention for a given VLAN.

2.單項選擇題Which statement best describes ACL configuration using configuration session mode on Cisco Nexus switches？（）

A. The verify command will validate commands entered for syntax errors.
B. The save command will save the commands entered to the startup configuration.
C. The network administrator can perform a dry-run ACL configuration by verifying the configuration against the hardware and software resources available before applying it.
D. Configuration sessions can be saved and resumed at any time， even after upgrading NX-OS Software on the switch with ISSU.
E. Configuration sessions are global for all VDCs on the Nexus 7000.

3.單項選擇題What is the benefit of using Anycast RP via RFC 4610 for IP multicast RP redundancy？（）    

A. Improves convergence of the multicast network due to enhanced RPF checks
B. Simplifies the number of control plane protocols over other RP redundancy methods
C. Eliminates the use of Protocol Independent Multicast （PIM） in the topology
D. Increases the administrative distances in Multicast Source Discovery Protocol （MSDP） configuration

4.單項選擇題

2012 Feb 23 23：00：08.676710 pim： [16132] （default-base） Received unauthenticated hello- message from 10.1.1.2 on Ethernet1/18， message discarded 2012 Feb 23 23：00：12.528763 pim： [16132] （default-base） Send Hello with AH on Ethernet1/18 from 10.1.1.1， holdtimE. 105 secs，dr-priority：1 
You are troubleshooting a PIM neighbor adjacency that is not coming up. You issued the command show ip pim neighbor e1/18 and confirmed there is no PIM neighbor on the interface. What is the problem based on the debug output？（）

A. The peer router 10.1.1.2 has PIM disabled on its interface connecting to Ethernet1/18.
B. The peer router 10.1.1.2 has the wrong PIM password configured on its interface connecting to Ethernet1/18.
C. The local router 10.1.1.1 has the wrong PIM password configured on Ethernet1/18.
D. The peer router 10.1.1.2 does not have PIM hello authentication enabled on its interface connecting to Ethernet1/18.
E. The local router 10.1.1.1 does not have PIM hello authentication enabled for Ethernet1/18.

5.單項選擇題On the Cisco Nexus 7000 Series Switch， Control Plane Policing is enforced on which component？（）

A. The supervisor module enforces CoPP before out-of-policy traffic reaches the CPU
B. The fabric modules enforce CoPP in the fabric before out-of-policy traffic reaches the CPU 
C. The linecards enforce CoPP locally before out-of-policy traffic reaches the CPU
D. The egress virtual output queue enforces CoPP locally before out-of-policy traffic reaches the CPU

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